Dull; not reflective of light.
A decorative border around a picture used to inset and center the contents of a frame.
The molten metal sulfide phases typically formed during smelting of copper, nickel, and other base metals.
A background, often painted or created with computers
dulled or intentionally blunt.
out of focus; blurry.
To sharpen (an image) by creating a blurred ("unsharp") negative as a mask, and then combining that mask with the original.